Separator for pulverized material



i 1.5, 3 r 7 w. H. HARTMAN 1,770,850

v I SEPARATOR FOR 'PULVERIZED MATERIAL Filed April 10, 1929 2 Sheets-Sheet 1 gwwmto't I W15. Hark/2am awe um July 15, 1930. wflH. HARTMAN I I 0 I I SEPARATOR FOR PULVERIZED MATERIAL Filed April 10. 1,929 2 Sheets-Sheet 2 gmento v Patented. July 15, 19 3 UNITEDTSTATES PATENT OFFICE WILLIAM H. HARTM'AN, or cannon, OHIO, ASSIGNOR To JONES Aim HARTMAN, 11m,

OF CANTON, OHIO, A CORPORATION OF OHIO SEPARATOR FOR PULVERIZED MATERIAL Application filed April 10, 1929'. Serial No. 354,052.

swept ball mill.

The invention relates to separators for air separation of pulverized materials of various kinds, such for instance as coal, cement or lime; and more particularly to such a separator adapted for use in connection with an air The object of the improvement is to provide a pulverizing mill arranged to permit g passing of large volumes of air therethrough separator and being classified into a determined fineness, the coarser material returning to the feed end of the mill.

The above and other objects may be attained by constructing the improved apparatus in the manner illustrated in the accompanying drawings, in which Figure 1 is a longitudinal section through a pulverizing mill showing the improved air separator associated therewith;

Fig. 2, a transverse sectional view through the separator; and

Fig. 3, a plan sectional'view through the separator, taken substantially on the line 33, Fig. 1.

Similar numerals refer to similar throughout the drawings.

The mill, indicated generally at 10, may be a ball mill of more or less standard type, the journal portions 11 and 12 being of suf ficient diameter'to permit passing a large parts volume of air through the mill in order to convey the fine material from the mill by air under control.

These journals are mounted in suitable bearings 13 of usual design and the cylinder of the mill may be rotated as by the ring gear 14 fixed thereon, meshing with a pinion 15 upon the shaft 16, a pulley 17 upon said shaft being connected, as by the chain belt 18, to a pulley 19 upon the shaft 20 of the motor 21 I A feed hopper 22 may be provided with a chute 23 communicating with the inlet end of the mill, and air in motion may be admitted thereto as bythe pipe 23 Feeding mechanism is preferably located in the enclosed chute 23, beneath the hopper, and in position to receive material from the hopper and feed the same through the chute, to the entrance end of the mill.

This feeding mechanism may be in the form of a reciprocating trough 24, supported by means of the side flanges 25, upon the rollers 26, located at opposite sides of the enclosed chute, and j ournaled upon the short shafts 27,

carried by the side walls of the chute.

A depending flange 28 is fixed to the lower end of the hopper 22, and extends into the reciprocating trough 24, being of a size and shape to substantiallyconform to the cross sectional shape of the trough, whereby material fed to the trough, from the hopper is prevented from passing out of the trough exceptthrough the open left-hand end, as viewed in Fig. 1.

A depending lug 29 is fixed upon the under side of the reciprocating trough 24, and a lug 30 is adjustably mounted below the trough and adapted to be held in adjusted position with reference to the lug 29, by any suitable means.

This adjusting means may comprise a screw 31, threaded through an internally threaded lug 32, fixed upon the under slde of the trough, the lug 30 being swiveled upon the inner end of said screw, and any suitable operating means, such as the hand wheel 33, being mountedupon the outer end of the screw.

With this arrangement the lug 30 may be adjusted toward or from the fixed lug 29, and held in any desired position, with relatlon thereto, in order to control the length of stroke of the reciprocating trough, as will be later described.

For the purpose of continuously reciprocating this trough, to feed material from the hopper to the mill at the desired speed, a bell crank lever is pivoted w1th1n the feed chute, as indicatedat 35. i

A pair of arms 36 of thls bell crank 1s located between the fixed lug 29 and the adjustable lug 30, the other arm 37 thereof being pivotally connected, at its end as shown at 38, to a pitman rod 39, connected, as by the crank arm 40, to a suitable rotating member,

such as the shaft 41.

This shaft 41 may be rotated by any suitable means such as the worm wheel 42 driven by the worm' 43 fixed upon the shaft 16 and housed within a suitable housing shown at 44.

It will be seen that as the shaft 41 rotates, the rod 39 will oscillate the bell crank lever 3637 and the rollers 45 upon the upper ends of the arms 36 will engage between the fixed lug 29 and adjustable lug 30 and reciprocate the trough 24.

A By spacing the adjustable lug, 30 further from the fixed lug 29 the length of the stroke of the reciprocating trough may be shortened, the adjustment shown in Fig. 1 of the drawings providing for the maximum stroke of 20 the trough.

It will be seen that, viewing thefeeding mechanism in the position shown in Fig. 1, with each movement of the trough 24 toward the left, more material will be deposited upon the trough from the feed hopper 22 and with each movement of the trough to the right, the depending Wall 28 will I from moving in this direction with the trough, thus causin a certain amount of the material to be displaced from the left-hand end of the trough.

By adjusting the stroke of the trough, it

will be seen'that the amount of material fed with each complete operation of the trough may be increased or diminished as desired. It will be seen that this feeding mechanism is of such a type that it will form an air seal,

preventing the escape of air from the mill through the feed hopper.

A pipe 46 communicates with the discharge end of the grinding mill and is inclined backward, and-upward over the mill, as indicated at 47 communicating at its upper end with the separator; to which the invention per- -tains. This separator comprises the external cone 48 and the internal cone 49 concentrically located therein.

These cones are inverted as shown in Figs. 1 and 2, and the lower reduced end portion of the outercone communicates with the feed chute 23 as indicatedat 50. A cover plate 51 is fixed upon the upper end of the external cone, and the internal cone is supported therefrom, as best shown in Fig. 2.

Communication is provided upper ends of the cones by means of a plurality'of spaced adjustable vanes 52, each vane being, mounted upon a rod 53 which projects through the cover plate 51 and may be provided with an angular handle portion 54 for oscillating the vanes upon their pivots.

As best shown in Fig. 3, the pipe 46, leading I from the discharge end of the grinding mill,

preferably enters the outer cone tangentially.

' A centrally located pipe 55 communicates prevent-the material between the 7 The lower end of the internal cone 49 terminates within the feed chute 23 and is provided with the substantially vertical door 56 hinged, at its upper end, as at 57; and adapted to remain normally closed, as indicated in Fig. 2. A valve 58 is provided in the feed chute below the separator and adapted to regulate and control the passage of air, from the pipe 24, to the grinding mill and separator.

In the operation of the apparatus the material to be pulverized is placed in the hopper 22 and fed, through the feed chute 23, to the grinding mill, by means of the feed mechanism above described.

Air in motion is admitted to the feed chute 23, from the pipe 23 the greater portion thereof passing through the grinding mill 10 and carrying the pulverized material in suspension upward through the pipe 46 to the separator, while a portion of the air passes upward between the inner and outer cones of the separator.

The material, suspended in the air, is carried through the vanes 52, to the inner cone, the lighter inaterial passing upward with the air through the pipe 55, While the heavier material is thrown to the outside of the cone 49 and passes down to the bottom thereof.

As material accumulates against the door 56, the weight of the material will open the door, permitting the material to enter the feed chute 23 and be carried by the air back into the mill for regrinding.

1. A separator including inner and outer cones communicating with each other at their upper ends, a material conveying pipe communicating with the upper end of the outer cone, a material discharge pipe communicating with the upper end of the inner cone,- and means for passing air in motion upward between the cones.

2. A separator including inner and outer cones communicating with each other at their upper ends, a material conveying pipe communicating tangentially with the upper end ofthe outer cone, a material discharge pipe communicating with the upper end of the cone, and means for passing an in motion upward between the cones.

4. A separator including inner and outer conesconnnunicating with each other at their upper ends, a material conveying pipe communicating tangentially with the upper end of the outer cone, a material discharge pipe communicating axially with the upper end of the inner cone, and means for passing air in motion upward between. the cones.

5. A separator including inner and outer cones communicating with each otherat their upper ends, a material conveying pipe communicating with the upper end of the outer cone, a material discharge pipe communicating with the upper end of the inner cone, a feed chute communicating with the lower end of the outercone, a normally closed door at the lower end of the inner cone, and means for admitting air in motion to the feedchute.

6. A separator including inner and outer wcones, vanes at the upper portion of the inner cone'providing communication with the outer cone, a material conveying pipe communlcating with the upper end of the outer cone, a material discharge pipe communicatx ing with the upper end of the inner cone,

' inner cone, and means for passing air in motion u ward between the cones.

8. separator including inner and outer cones, vanes at the upper portion of the inner cone providing communication with the outer cone, a material conveying pipe comcommunicating with the upper end of the in- 4 ner cone, means for passing air in motion up-' ward between the cones, and means for adjusting the position of they vanes.

12. A separator including inner and outer cones, vanes at the upper portion of the inner cone providing communication with the outer cone, a material conveying pipe communicating with the upper end of the outer cone,- a material discharge pipe communicating axially with the upper end of the inner cone, means for passing air in motion upward between the cones, and means for adjusting the'position of the vanes.

13. A separator including inner and outer cones, vanes at the upper portion of the inner cone providing communication with the outer cone, a material conveying pipe com- N municating tangentially with the upper end I of the outer cone, a material discharge pipe communicating axially with the upper end of the inner cone, means for passing air in motion upward between the cones, and means for adjusting the position of the vanes.

In testimony that I claim the above, I have hereunto subscribed my name.

WILLIAM H. HARTMAN'.

municating with the upper .end of the outer I I cone, a material discharge pipe communicating axially with the upper end of the inner cone, and means for passing air in motion upward between the cones.

9. A separator including inner and outer cones, vanes at the upper portion of the inner cone providing communication with the outer cone, a material conveying pipe communicating tangentially with the upper 1 end of the outer cone, a material discharge pipe communicating axially with the upper end of the inner cone, and means forpassing air in motion upward between the cones. 10. A separator including inner and outer cones, vanes at the upper portion of the inner cone providing communication with the outer cone, a material conveying pipe communicating with the upper end of the outer cone, a material discharge pipe communicat' ing with the upper end of the inner cone, and means for passing air in motion upward between the cones, and means for adjusting the position of the vanes.

11. A separator including inner and outer cones, vanes at the upper portion of the inner cone providing communication with the outer cone, a material conveying pipe communicating tangentially with the upper end 

